There is no doubt      the earth is becoming warmer.
A．whetherB．thatC．ifD．why
B
考查固定句型。There is no doubt that…后面是一個(gè)同位語(yǔ)從句解釋doubt的內(nèi)容。句意：毫無(wú)疑問(wèn)地球正在變暖。
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